<!DOCTYPE html>
<div style="transform: scale(0.5); transform-origin: 0 0">
  <iframe id="iframe" style="width: 800px; height: 800px"
    srcdoc="<div id='div' style='position: absolute; top: 400px; left: 400px; width: 200px; height: 200px; background-color: green'></div>">
  </iframe>
</div>
<p style="position: absolute; top: 400px">
Tests paint invalidation in a scaled iframe. Passes if there is no red.
</p>
